Quantitative Identification Method of Urban Multi-center Based on Multi-source Open Data
Conducting research on urban multi-center is of significant importance for optimizing urban spatial structure,rational allocation of spatial elements,and strengthening urban planning and management.Existing studies have conducted numerous empirical research on urban multi-center identification,but a unified set of evaluation criteria has yet to be established.Therefore,based on multi-source open data such as Points of Interest(POI),population distribution,and road networks,this paper constructs a set of quantitative identification methods for urban multi-center in terms of structural morphology,intensity level,and functional classification.For the structural morphology,based on the multi-attribute weighted analysis of POI data,we constructed a multi-center structural characteristic index"center clustering degree"and identified the scope and boundary of urban multi-center through the parameter-optimized local contour tree algorithm.For the intensity level,by constructing the Urban Multi-center Comprehensive Service Intensity Indicator(UCSI),and according to"Head-Tail Breaks"rule,we divided the intensity patches within the multi-center and calculated the Urban Multi-center Intensity Level(UCL).For functional classification,the functional combination relationship and classification of multi-center was identified by calculating the frequency share of POI data after incorporating weighted attributes.Finally,an empirical simulation was conducted using the city of Xi'an as a case study.Results show that Xi'an city's traditional single-core urban structure exhibited a distinct diffusion trend,having a total of 21 urban centers(three main urban centers,five secondary urban centers,and 13 regional centers)with their locations and boundaries specified.The intensity level of each urban center was characterized by a decreasing"core-periphery"circle.And four urban composite functional centers,12 urban dual-functional centers,and five urban single-functional centers were identified.The research results show that the quantitative identification method established in this paper can accurately and systematically identify the characteristics of urban multi-center development.This paper also puts forward corresponding policy suggestions for the prominent problems in the process of multi-center development of large cities and provides reference for the preparation and implementation of urban planning.
multi-center identificationmulti-source open datastructural morphologyintensity levelfunction-al classificationquantitative identificationXi'an city
NETL
NSTL
万方数据
